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Chiral triaryl phosphates promote the enantioselective iodolactonization of 4‐substituted 4‐pentenoic acids to give the corresponding iodolactones in high yields with high enantioselectivity. N‐Chlorophthalimide (NCP) is employed as a Lewis acidic activator and oxidant of I2 for the present iodolactonization. In combination with 1.5 equivalents of NCP, only 0.5 equivalents of I2 are sufficient to...
Die intra‐ und intermolekulare Titelreaktion wird von einer in situ erzeugten Ammonium(hypo)iodit‐Spezies katalysiert. Sowohl H2O2 als auch tert‐Butylhydroperoxid (TBHP) können als umweltverträgliches Oxidationsmittel verwendet werden, und ein breites Spektrum von Substraten reagiert zu den jeweiligen α‐Acyloxycarbonyl‐Verbindungen in guter bis hervorragender Ausbeute.
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